The Wajak crania are two fossil human skulls discovered near Wajak, a village in Tulungagung Regency, East Java, Indonesia in 1888/90. The first was found on 24 October 1888 by mining engineer B.D. van Rietschoten who sent it to paleontologist Eugène Dubois who subsequently found the second skull in September 1890. When returning to the Netherlands in 1895, Dubois took the skulls with him. They are now located in Naturalis, Leyden.